Relearned, on Schedule: Successive Relearning
Successive relearning fuses retrieval practice with spacing — recalling every item to at least one correct retrieval in each of several sessions spread across days — and it is the most durable study protocol yet documented. · 11 min
This unit has handed you two of the strongest findings in the whole science of studying. Retrieval practice: recalling beats rereading (folio 5). Spacing: the same hours, spread across days, beat the same hours massed into one sitting (folio 7). A natural question follows — what happens if you do both at once, deliberately, to every fact you mean to keep? That combination has a name, a measured recipe, and a result large enough to be worth the whole unit. It is the closest thing this course has to a complete study protocol, and it is what this Archive runs on your own memory once a folio is behind you.
Guess before you learn
Two groups learn the same 40 key terms and reach the same score on a first test. Group A studies them once, thoroughly, in a single sitting. Group B relearns them across four short sessions spread over two weeks — each session recalling every term until it comes back correctly. A month after that, both are tested again. Roughly what happens?
Group B keeps roughly 80% to Group A's roughly 20% — a fourfold difference from rearranging the same studying. If you backed Group A, you judged by how solid single-session study feels on the day. This folio is about the arrangement that feels ordinary while you do it, yet lasts.
9–12
3–5
Getting an answer right once does not mean you own it. Successive relearning is a simple habit: bring each fact back on several different days, and on each day keep trying until you can recall it correctly. Not reread it — recall it, without looking. A fact you have pulled from memory on Monday, Wednesday, and Saturday is far harder to lose than one you studied all at once.
It feels slow, because you keep returning to things you thought you already knew. That returning is the point: each spaced recall repairs the fading and resets the clock.
6–8
Successive relearning is two proven ideas fused into one routine. First, retrieval practice: you recall each item from memory rather than rereading it (folio 5). Second, spacing: those recall sessions are spread across several days (folio 7). The rule that joins them is a criterion — in each session you keep retrieving an item until you get it right, then move on. One correct recall per item, per session, several sessions apart.
Rawson and Dunlosky tested this in real college courses. Students who studied key terms the usual way retained roughly 20% of them weeks later; students who ran successive relearning retained roughly 80%. Same terms, ordinary effort — arranged as spaced relearning to a criterion.
9–12
The protocol has a measured shape. Rawson and Dunlosky (2011) asked how much practice is enough and found a near-optimal recipe: in the first session, recall each item correctly three times; then, in three later sessions spread across days, relearn each item to just one correct recall. Six successful retrievals in all, distributed rather than massed, buy retention that ordinary study cannot approach.
Their 2013 classroom study (Rawson, Dunlosky, and Sciartelli) carried the finding out of the laboratory: undergraduates who relearned key concepts across spaced sessions scored higher on real course exams and still held the material at the end of term. The gain compounds because each session both measures and repairs the memory — the test is the study.
K–2
You learn a new word on Monday. On Wednesday you try to say it from memory — and you can. On Friday you try again. Each try, days apart, makes the word stick harder.
One try is not enough. You come back, again and again, on different days — and each time you pull it out of your own head. That coming back is the whole trick.
Undergrad
Why does relearning outperform its ingredients used alone? Each spaced retrieval arrives after storage strength has grown but retrieval strength has partly lapsed — the condition Bjork's theory identifies as maximally potent for a durable gain (folio 11 formalizes it). Bahrick's earlier relearning work pointed the same way: material relearned across spaced sessions reaches a near-permanent store that single-session study never touches.
The criterion matters as much as the spacing. Stopping at first correct recall in each session — rather than dropping an item the instant it appears once, or drilling it ten times over — is what makes the protocol efficient as well as durable. Rawson and Dunlosky frame it as retention bought per minute invested: relearning, not over-learning, is the economical route.
Postgrad
Successive relearning is best read as the applied convergence of the two largest effects in this literature — the testing effect and distributed practice — disciplined by a recall criterion. Rawson, Dunlosky, and Sciartelli (2013) report advantages on course exams well above typical study, widening at longer retention intervals: the signature of a storage-strength manipulation rather than a transient performance boost.
Two parameters govern the return: the initial criterion — correct recalls before an item is retired for a session — and the relearning schedule of session count and spacing. Rawson and Dunlosky's parametric work locates a broad efficient region: a modest initial criterion and several spaced relearning sessions, beyond which added drill yields diminishing durability per unit time. The prescription is exact — relearn to criterion, space the sessions, then stop.
successive relearning
Recalling each item from memory to a set criterion — at least one correct retrieval — in each of several sessions spread across days. Retrieval practice and spacing, run together on purpose.
Why is this true?
Why does relearning beat simply studying each item until you first get it right?
Because one correct recall fades. Returning days later, after the memory has partly lapsed, forces an effortful retrieval that builds durable storage — and repeating that across sessions each time resets the forgetting curve to a shallower slope.
Now lift that floor. The month-later figure of roughly 20% is what single-session study leaves behind. Successive relearning, on the same terms and comparable total effort, leaves behind roughly 80% — the two conditions swap the majority of the material between them. The difference is not more studying. It is retrieval instead of rereading, spread across days instead of massed, with a simple rule for when each item is done: you recalled it correctly, so move on, and meet it again next session.
Here is the protocol laid out. First session: study each item, then recall it from memory until it comes back correctly — Rawson and Dunlosky used three correct recalls to start. Later sessions, spread across days: retrieve each item; if it comes back, you are done with it for the day; if it does not, restudy briefly and try again until one correct recall. Repeat across several sessions, letting the gaps widen as the material firms. The sessions are short because most items now come back on the first try — you are repairing a few, not learning them all again.
Count the successful retrievals in one relearning schedule — the steps fade as you master them
3
3 x 1 = 3
3 + 3 = 6
Successive relearning is the practical summit of this unit, but it stands on a single idea that runs beneath all of it: the study that feels hardest in the moment — spacing, testing, relearning things you thought you knew — is often the study that lasts. The next folio names that idea directly, states the theory behind it, and draws the line where a helpful difficulty turns into a pointless one.
Practice — new ink and old, interleaved
1.In one sentence, explain why easy cards end up reviewed far less often than hard ones under SM-2.
2.Order the life of a reviewed memory, first to last.
- Learn the list to full strength
- The curve falls steeply through the first day
- A review restores full strength
- The new curve falls more slowly than the first
3.From folio 5: within each relearning session you recall the item rather than rereading it. Why does that choice matter?
4.A card passes at an interval of 15 days with an ease factor of 2.5. What is its next interval, in days?
5.From folio 7: the best review gap is roughly 10-20% of how long you need to remember. For a test 40 days away, the middle of that range is a gap of about how many days?
6.From folio 4: SM-2 depends on your honest 0-to-5 grade. Why is over-grading a card you recalled only shakily a mistake?
7.From folio 8: a card passes at intervals of 1 day, then 6 days, with an ease factor of 2.5. About how many days is the next interval?
8.In one sentence, state the spacing effect.
9.You have 30 vocabulary terms and a test in three weeks. Which plan is successive relearning?
10.From memory: why is successive relearning called the most powerful documented study protocol?
It combines the two largest effects in the field — retrieval practice and spacing — held to a recall criterion, and in classroom experiments it raised retention from roughly 20% to roughly 80%, an advantage that grows at longer delays.
How close were you? Grade yourself honestly — it sets your review date.
11.A meta-analysis reports retrieval practice at g ≈ 0.61. What does that number mean?
12.A friend recalls every term correctly once tonight and calls it done. In one sentence, say what successive relearning adds that this plan lacks.
13.Match each part of the protocol to what it contributes.
14.From folio 9: successive relearning across mixed material also interleaves it. What does interleaving add on top of spacing?